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Research partially supported by N.S.F. Grant No. MCS 8301365 and the Guggenheim Foundation
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Lawson, H.B., Michelsohn, ML. Approximation by positive mean curvature immersions: frizzing. Invent Math 77, 421–426 (1984). https://doi.org/10.1007/BF01388831
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DOI: https://doi.org/10.1007/BF01388831